CDP1879CD1
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CDP1879CD1

Product Category: IC Chips
Manufacturer: INTRSIL
Description:
  datasheetCDP1879CD1 Datasheet
Package: AUCDIP
Quantity: 880 PCS
Lead Free Status / RoHS Status: Lead free / RoHS Compliant
Moisture Sensitivity Level(MSL): 3(168 Hours)
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Manufacturer: INTRSIL
Product Category: IC Chips
Features, Applications

Description

The CDP1879 real-time clock supplies time and calendar information from seconds to months in BCD format. It consists of 5 separately addressable and programmable counters that divide down an oscillator input. The clock input can have any one of 4 possible frequencies, allowing flexibility in the choice of crystal or external clock sources. Using an external 32kHz clock source, timekeeping can be performed down to 2.5V (see Standby (Timekeeping) Voltage Operation). The device can be memory-mapped for use with any general-purpose microprocessor and has the additional capability of operating in the CDP1800 series input/output mode. The real-time clock functions as a time-of-day/calendar with an alarm capability that can be set for combinations of seconds, minutes or hours. Alarm time is configured by loading alarm latches that activate an interrupt output through a comparator when the counter and alarm latch values are equal. Fifteen selectable square-wave signals are available as a separate clock output signal and can also activate the interrupt output. A status register is available to indicate the interrupt source. The value an 8 bit control register determines the operational characteristics of the device, by selecting the prescaler divisor and the clock output, and controls the load and alarm functions. A transparent "freeze" circuit preclude clock rollover during counter and latch access times to assure stable and accurate values in the counters and alarm latches. The CDP1879 is functionally identical to the CDP1879C-1. The CDP1879 has a recommended operating voltage range to 10.5V, and the CDP1879C-1 has a recommended operating voltage range to 6.5V. The CDP1879 and the CDP1879C-1 are supplied in 24 lead hermetic dual-in-line side-brazed ceramic packages (D suffix) and 24 lead dual-in-line plastic packages (E suffix).


Features

CPU Interface for Use with General-Purpose Microprocessors Time Of Day/Calendar Reads Seconds, Minutes, Hours Reads Day of Month and Month Alarm Circuit With Seconds, Minutes or Hours Operation Power Down Mode Separate Clock Output Selects of 15 Square Wave Signals Interrupt Output Activated By Clock Output and/or Alarm Circuit Date Integrity Sampling for Clock Rollover Eliminated On-Board Oscillator: - Crystal Operation 1.048MHz - Crystal Operation 32kHz - External Clock Operation or 32kHz Addressable in Memory Space or CDP1800 Series I/O Mode Low Standby (Timekeeping) Voltage with External Clock Related Literature - AN7275, Guide to the Use of CD1879 and CDP1879C1 Real Time Clock


INT RESET POWER DOWN RD IO/MEM TPB/WR TPA CS A2 VDD 23 XTAL 22 XTAL 21 CLK OUT 13 DB0

1. Seconds, minutes, hours, date and month counters 2. Status register to identify interrupt source 1. Control register to set device operation 2. Seconds, minutes, hours, date and month counters 3. Alarm latches for alarm time 1. Three-state interrupt output with active alarm or clock out circuitry for wake-up control 2. Data bus and address inputs are "DON'T CARE" 1. Clock out as source 2. Alarm time as source 3. Either interrupt can occur during normal or power down mode


CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. http://www.intersil.com 407-727-9207 | Copyright c Intersil Corporation 1999


DC Supply Voltage Range, VDD (Voltage referenced to VSS Terminal) to +7V Input Voltage Range, All Inputs. -0.5 to VDD +0.5V DC Input Current, Any One Input. ±10mA Device Dissipation Per Output Transistor. 40mW For TA = Full Package Temperature Range (All Package Types)


Thermal Resistance (Typical) JA (oC/W) JC (oC/W) PDIP Package. 60 N/A SBDIP Package. 50 12 Operating Temperature Range (TA) Package Type to +125oC Package Type to +85oC Storage Temperature Range to +150oC Lead Temperature (During Soldering). +265oC At Distance 1/16 ±1/32 in. ± 0.79mm) From Case for 10s Max


CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.


Operating Conditions TA = FuIl Package-Temperature Range, Unless Otherwise specified. For maximum reliability, operating conditions should be selected so that operation Is always within the following ranges: LIMITS CDP1879 PARAMETER DC Operating Voltage Range Input Voltage Range DC Standby (Timekeeping) Voltage (Note to +85oC (Note to +70oC Clock Input Rise or Fall Time, VDD = 5V VDD = 10V NOTES: 1. Timekeeping function only, no READ/WRITE accesses, 32kHz external frequency source only, no crystal operation. 2. See Standby (Timekeeping) Voltage Operation. tR, 10 μs VSTBY V MIN 4 VSS MAX 10.5 VDD CDPl879C-1 MIN 4 VSS MAX 6.5 VDD UNITS V


FREEZE CIRCUIT - PM AND HOUR LOGIC CALENDAR LOGIC

XTAL OSCILLATOR PRESCALE SECOND MINUTE HOUR DAY MONTH

COMPARATOR SECOND LATCH MINUTE LATCH HOUR LATCH

FIGURE 1. REAL-TIME CLOCK FUNCTIONAL DIAGRAM TABLE 1. CONTROL REGISTER BIT ASSIGNMENT Bit 1, 0 Frequency 00 Select 10 11 Bit 2 Start/Stop 1 = Start 0 = Stop ADDRESSES Latch, Counter Seconds Latch, Counter Minutes Latch, Counter Hours Counter, Day Counter, Month Control, Register Status Register TABLE A1 A0


MSB of Hours Counters (Bit is an AM-PM Bit. 0 = AM; = PM Bit 6 of Hours Counter Controls 12/24 hr. = 12 Hr: = 24 Hr. Status Register: Bit 7 MSB = Alarm Interrupt Source: Bit 6 = Clock. MSB of Month Counter (Bit is a Leap Year Bit 0 = No, 1 = Yes.

Search Part number : "CDP18" Included word is 15
Part Number Manufacturer Package Quantity Description
CDP1804ACD INTERS AUCDIP 684
CDP1824CD HAR AUCDIP 82
CDP1854ACE HARRIS DIP40 73
CDP1879CE1 RCA DIP24 156
CDP1802ACD HARRIS CDIP40 517
CDP1804CD INTERS AUCDIP 679
CDP1824CE N/A DIP18 490
CDP1854ACQ INTERSIL PLCC 650
CDP1879CEI HAR DIP 86
CDP1802ACD3 INTEL DIP 862 Microprocessors - MPU 40 PIN SBDIP(5V)
CDP1804D INTERS AUCDIP 714
CDP1824D RCA DIP 98
CDP1854AE RCA PDIP 168
CDP1881CE INTERSIL DIP20 567
CDP1802ACD3(CDP1802ACD) INTERS AUCDIP 714
CDP1879CD1 RELATED PRODUCT PICTURE
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